An injection mold with easy demolding

Abstract

This utility model discloses an easy-to-demold injection mold, relating to the field of injection molding equipment. The easy-to-demold injection mold includes a punch and a die. The die includes two sets of symmetrically arranged movable molds. A forming chamber for injection molding is provided between the two sets of movable molds and the punch. An ejector is provided on the punch. When the molten material solidifies in the forming chamber, a drive cylinder drives the two sets of movable molds to move to both sides, opening them up so that the formed workpiece is on the outer surface of the protrusion. At this time, the movable molds move away from the surface of the wedge block. Under the action of a spring, the ejector pin moves outward, pushing the workpiece off the protrusion. The workpiece falls naturally, completing the demolding process. This replaces the traditional demolding and ejector device. The ejector does not require a dedicated drive component and ensures that the workpiece does not stick to the die, resulting in lower cost and greater reliability.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, specifically to an easy-to-demold injection mold. Background Technology

[0002] Injection molds are preforms used in the injection molding process to inject plastic into the mold to form a specified shape. By setting cavities in the mold, the plastic is filled into the cavity and then solidified to achieve the injection molding process.

[0003] In actual injection molding, the entire injection mold generally includes at least one cavity and one punch. After the injection solidifies, the cavity and punch separate, and then the workpiece is removed. To facilitate quick demolding, an ejector is usually designed in the cavity or punch. Currently, the ejector is often driven by electric or pneumatic means. This means that after the mold is separated, electric or pneumatic drive components are needed to control the extension and retraction of the ejector, which increases costs. Furthermore, when the mold is opened, the workpiece may still be on the cavity or punch, so ejector components need to be set on both, which is very troublesome. Therefore, an injection mold with easy demolding is provided. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an easy-to-demold injection mold, which solves the problem that in existing injection molds, the ejector components are mostly driven by electric or pneumatic methods. This requires the use of electric or pneumatic drive components to control the extension and retraction of the ejector components after mold separation, increasing costs. Furthermore, during mold opening, the workpiece may exist on the die or the punch, so ejector components need to be set on both, which is very troublesome.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an easy-to-demold injection mold, comprising a punch and a die, wherein the die comprises two sets of symmetrically arranged movable molds, and a forming chamber for injection molding is provided between the two sets of movable molds and the punch. The punch is provided with an ejector, which includes an ejector pin, a wedge block, and a spring. The ejector pin is fixedly connected to the inner end of the wedge block, and the spring is disposed at the inner end of the wedge block. The outer ends of the ejector pin and the wedge block respectively movably penetrate the punch, and the outer end of the wedge block is located on the sliding path of the two sets of movable molds, so that when the movable mold moves away from the wedge block, the spring pushes the ejector pin to move outward for automatic ejection.

[0006] Preferably, the punch has an integrally formed protrusion, the movable die has an inner recess, and the protrusion and the recess form the forming chamber.

[0007] Preferably, the ejector pin is movably disposed in the protrusion, and the outer end of the ejector pin and the outer wall of the protrusion together form a smooth curved surface.

[0008] Preferably, the back of the punch is integrally formed with a receiving cavity, and a connecting strip is fixedly connected between the ejector pin and the wedge block. The connecting strip and the spring are both disposed in the receiving cavity.

[0009] Preferably, the punch is provided with an injection port that penetrates the protrusion.

[0010] Preferably, the outer wall of the punch is provided with a groove, and the outer wall of the movable die is integrally formed with a slider, which is slidably connected in the groove.

[0011] Preferably, a drive cylinder is fixedly installed on both sides of the outer wall of the punch, and a push rod is fixedly connected between the output end of the two sets of drive cylinders and the two sets of movable molds.

[0012] Preferably, both the punch and the die are provided with cooling channels inside, and both the punch and the die are equipped with coolant circulation interfaces connected to the cooling channels.

[0013] Preferably, one set of the movable molds has a sealing protrusion integrally formed on it, and the other set of the movable molds has a sealing groove adapted to the sealing protrusion.

[0014] Its beneficial effects are as follows: This easy-to-demold injection mold, after the molten material solidifies in the molding chamber, drives the two sets of movable molds to move to both sides and spread them apart, so that the molded workpiece is on the outer surface of the protrusion. At this time, the movable mold moves away from the surface of the wedge block. Then, under the action of the spring, the ejector pin moves outward and pushes the workpiece off the protrusion. The workpiece falls naturally and the demolding is completed. This replaces the traditional demolding and ejection device. The ejector does not need to be specially set with a driving component, and it can ensure that the workpiece will not stick to the cavity mold. It is lower in cost and more reliable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall back of this utility model; Figure 3 This is a schematic diagram of the unfolded state of the concave mold of this utility model; Figure 4 This is an exploded view of the overall structure of this utility model.

[0017] In the diagram: 1. Punch; 12. Protrusion; 13. Ejector; 131. Receiving cavity; 132. Ejector pin; 133. Connecting strip; 134. Wedge block; 135. Spring; 14. Slide groove; 15. Injection port; 2. Cavity; 21. Movable mold; 22. Sealing protrusion; 23. Slider; 24. Recess; 3. Coolant circulation interface; 4. Drive cylinder; 5. Push rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] This utility model discloses an easy-to-demold injection mold, according to the attached... Figure 1-4 As shown, the device includes a punch 1 and a die 2. The die 2 includes two sets of symmetrically arranged movable molds 21. A molding chamber for injection molding is provided between the two sets of movable molds 21 and the punch 1. The punch 1 is provided with an ejector 13, which includes an ejector pin 132, a wedge block 134 and a spring 135. The ejector pin 132 is fixedly connected to the inner end of the wedge block 134. The spring 135 is located at the inner end of the wedge block 134. The outer ends of the ejector pin 132 and the wedge block 134 respectively move through the punch 1. The outer end of the wedge block 134 is located on the sliding path of the two sets of movable molds 21, so that when the movable mold 21 moves away from the wedge block 134, the spring 135 pushes the ejector pin 132 to move outward for automatic ejection.

[0021] The punch 1 has an integrally formed protrusion 12, and the inner side of the movable die 21 has a recess 24. A forming cavity is formed between the protrusion 12 and the recess 24. The ejector pin 132 is movably disposed in the protrusion 12, and the outer end of the ejector pin 132 and the outer wall of the protrusion 12 together form a smooth curved surface.

[0022] The back of the punch 1 is integrally formed with a storage cavity 131. A connecting strip 133 is fixedly connected between the ejector pin 132 and the wedge block 134. The connecting strip 133 and the spring 135 are both set in the storage cavity 131. The punch 1 is provided with an injection port 15 that passes through the protrusion 12. When in use, the injection port 15 is connected to the injection molding machine.

[0023] The outer wall of the punch 1 is provided with a groove 14, and the outer wall of the movable mold 21 is integrally formed with a slider 23. The slider 23 is slidably connected in the groove 14, so that the movable mold 21 will not deviate when sliding. At the same time, the slider 23 makes the movable mold 21 fit tightly against the surface of the punch 1, ensuring that the forming cavity between the movable mold 21 and the punch 1 will not leak during injection molding.

[0024] Both sides of the outer wall of the punch 1 are fixedly installed with drive cylinders 4. The output ends of the two sets of drive cylinders 4 are respectively fixedly connected with push rods 5 between the two sets of movable molds 21, which are used to drive the two sets of movable molds 21 to perform opening and closing actions.

[0025] Both the punch 1 and the die 2 are equipped with cooling channels inside. Both the punch 1 and the die 2 are equipped with coolant circulation interfaces 3 connected to the cooling channels. The coolant circulation interfaces 3 are connected to an external circulating chiller. When the injection molding machine injects molten material into the molding cavity, the circulating chiller is started, so that the coolant circulates inside the die 2 and the punch 1, allowing the molten material to cool and solidify quickly.

[0026] One set of movable molds 21 has an integrally formed sealing protrusion 22, and the other set of movable molds 21 has a sealing groove adapted to the sealing protrusion 22, so as to prevent material from leaking from the connection between the two sets of movable molds 21 when they are closed.

[0027] Working principle: When in use, the injection port 15 is connected to the injection molding machine, and the coolant circulation port 3 is connected to an external circulating chiller. During use, the two sets of movable molds 21 are driven to move towards the center by the drive cylinder 4. The two sets of movable molds 21 squeeze the wedge block 134, causing the wedge block 134 to drive the ejector pin 132 to retract into the protrusion 12. At this time, the spring 135 is compressed, causing the sealing protrusion 22 to insert into the sealing groove. Then, the injection molding machine injects molten material into the molding cavity, and then the circulating chiller is activated. The movement causes the coolant to circulate inside the concave mold 2 and the convex mold 1, allowing the molten material to cool and solidify rapidly. Then, the driving cylinder 4 drives the two sets of movable molds 21 to move to both sides and spread them open, so that the formed workpiece is on the outer surface of the protrusion 12. At this time, the movable mold 21 moves away from the surface of the wedge block 134. Then, under the action of the spring 135, the ejector pin 132 moves outward, pushing the workpiece off the protrusion 12. The workpiece falls naturally to complete the demolding. This replaces the traditional demolding and ejection device, which is lower in cost and more reliable.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An injection mold with easy demolding comprising a male mold (1) and a female mold (2), characterized in that, The concave mold (2) includes two sets of symmetrically arranged movable molds (21). A molding chamber for injection molding is provided between the two sets of movable molds (21) and the punch (1). An ejector (13) is provided on the punch (1). The ejector (13) includes an ejector pin (132), a wedge block (134) and a spring (135). The ejector pin (132) is fixedly connected to the inner end of the wedge block (134). The spring (135) is located at the inner end of the wedge block (134). The outer ends of the ejector pin (132) and the wedge block (134) respectively move through the punch (1). The outer end of the wedge block (134) is located on the sliding path of the two sets of movable molds (21). When the movable mold (21) moves away from the wedge block (134), the spring (135) pushes the ejector pin (132) to move outward for automatic ejection.

2. A demoulding easy injection mould according to claim 1, characterized in that, The punch (1) has an integrally formed protrusion (12), and the movable die (21) has a recess (24) on its inner side. The protrusion (12) and the recess (24) form the forming chamber.

3. A readily demouldable injection mould according to claim 2, characterised in that The ejector pin (132) is movably disposed in the protrusion (12), and the outer end of the ejector pin (132) and the outer wall of the protrusion (12) together form a smooth curved surface.

4. A readily-releasable injection mold in accordance with claim 2 wherein, The back of the punch (1) is integrally formed with a storage cavity (131), and a connecting strip (133) is fixedly connected between the ejector pin (132) and the wedge block (134). The connecting strip (133) and the spring (135) are both set in the storage cavity (131).

5. A readily-releasable injection mold in accordance with claim 2 wherein, The punch (1) is provided with an injection port (15) that penetrates the protrusion (12).

6. A readily-releasable injection mold in accordance with claim 1 wherein, The outer wall of the punch (1) is provided with a groove (14), and the outer wall of the movable mold (21) is integrally formed with a slider (23), which is slidably connected in the groove (14).

7. A readily-releasable injection mold in accordance with claim 1 wherein, Both sides of the outer wall of the punch (1) are fixedly installed with drive cylinders (4), and push rods (5) are fixedly connected between the output ends of the two sets of drive cylinders (4) and the two sets of movable molds (21).

8. A readily-releasable injection mold in accordance with claim 1 wherein, Cooling channels are provided inside both the punch (1) and the die (2), and coolant circulation interfaces (3) connected to the cooling channels are installed on both the punch (1) and the die (2).

9. A readily-releasable injection mold in accordance with claim 1 wherein, One set of movable molds (21) has a sealing protrusion (22) integrally formed on it, and another set of movable molds (21) has a sealing groove adapted to the sealing protrusion (22).

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